加减乘除乘方英语讲解课件.ppt

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1、加、减、乘、除、乘方＋－×÷TheExpressionsaddition加3+4=？Howmuchisthreeplusfour?3+4=7plus(prep.)add(v.)Threeplusfourisseven.Threeandfourmakesseven.equalv./adj.Threeandfourisequaltoseven.Threeaddedtofourequalsseven.Ifyouadd4to3，youget7.What’sthreeplusfour?It’sseven.subtraction减10－6＝?Howmuchistenminussix?10－6

2、＝4minus(prep),subtract(v.)Tenminussixisfour.Wealsocanuse“take…from…”:Take(subtract)sixfromten,andtheremainderisfour.(remaindern.余下的部分)Sixtaken(subtracted)fromtenisfour.multiplication乘Times(prep.)ormultiply（v.）3×4＝?Howmuchisthreetimesfour?3×4＝12Threetimesfouristwelve.Multiplythreebyfour,wegett

3、welve.Threemultipliedbyfourmakestwelve.division除15÷5＝?Howmuchisfifteendividedbyfive?15÷5＝3Fifteendividedbyfiveisthree.Fifteendividedbyfiveequals/makesfour.Dividefifteenbyfive,wegetthree.power乘方乘方、幂power二次方，平方square三次方，立方cube四次方thepoweroffour,thefourthpowern次方thepowerofn,thenthpowerExample:Thr

4、eetothe8thpower（The8thpowerof3）3的8次方4tothepowerof3is4³.4的3次方是4³。Somefractions分数¾threefourths;threequarters½ahalf¼a/onequarter1½oneandahalf3¼threeandonefourth;threeandonequarterSomeexamples:一个半小时：oneandahalfhours二又四分之三米：twoandthree-fourthsmeters五分之四英寸：four-fifthsinchThankyou!